finally finished chem homework

[mwmorph]

"At a fixed temperature, equal moles of N2 (g) and F2 (g) are mixed in a constant pressure container (the volume of the container changes in order to keep the pressure at a constant value). The N2 (g) and F2 (g) are allowed to react, producing NF3 (g):

N2 (g) + 3F2 (g) ? 2 NF3 (g)

If the initial volume of the container, before any reaction takes place, is 5.70 L, determine the volume of the container volume in L after the N2 (g) and F2 (g) have reacted to completion."

Does anyone know how to do this? I have an 8am class today and it's 4:30 here already so I'm looking at about 2 hours of sleep as it is, TIA.

 

[1000000]

Is this 1st semester chem? I think its a limiting ragent question. Its been too long since I took chem.

 

[frostedflakes]

The relationship between volume and number of moles is directly proportional (i.e. if you double the number of moles, you double volume, of course assuming that temperature and pressure are constant). So if you start with four moles of gas and end with two, and temperature and pressure are constant as stated in the problem, volume should be 1/2 of the original, so 2.85L. Does this sound reasonable?

EDIT: And this is all assuming ideal gasses, which I'm guessing the question is for.

 

[mwmorph]

Yeah, this is Chem102

Frostedflakes: I've tried 2.85 Thankfully its this on line Lon-Capa program so I can instantly find out if the answer is right and 2.85L is not it for some reason.

Edit: Nevermind my mind just wasn't working. Between the barndance/ no sleep last night and no sleep this night i just wasn't thinking straight and was using the limiting reagent as the basis for number of moles produced from the final product(2/3 of a mol instead of the correct 2). On top of that I forgot the additional 2/3 of a mol of unreacted N2. The correct answer is 2.66mol which means (2.6666.../4)*5.7 which makes 3.80L. It's so mind numbingly simple now that I've got it.

If any prospective college freshmen read this, think twice before applying to engineering at UIUC. Once you see the amount of work you have to do compared to other majors, you'll get plenty jealous.

 

[1000000]

chem 102, then ignore my previous comment

EDIT: maybe if you gave more info such as the topic of the chapter this question relates to then mor epoeple can help you

 

[frostedflakes]

I think the problem is in that you have equal moles of each separate gas to start with, but they are consumed in the reaction at different rates, leaving one gas in the volume partially unreacted along with the product NF3. I did not even think to compensate for this at first, oops.

Assume you have an initial concentration of three moles for N2 and F2, so six moles total. F2 is reacted completely, so at the end of the reaction you have two moles N2, zero moles F2, and two moles NF3. The final number of moles is 2/3 the initial, so the volume should be 3.80L.

EDIT: Ah nevermind, glad you figured it out. Yeah engineering is a challenging, but that makes it kind of fun too. I'm not a big partier or anything so I don't mind devoting the time to it. Engineering phsycs 1 and calc 3 are currently kicking my butt.

 

[mwmorph]

Originally posted by: frostedflakes
I think the problem is in that you have equal moles of each separate gas to start with, but they are consumed in the reaction at different rates, leaving one gas in the volume partially unreacted along with the product NF3. I did not even think to compensate for this at first, oops.

Assume you have an initial concentration of three moles for N2 and F2, so six moles total. F2 is reacted completely, so at the end of the reaction you have two moles N2, zero moles F2, and two moles NF3. The final number of moles is 2/3 the initial, so the volume should be 3.80L.

EDIT: Ah nevermind, glad you figured it out. Yeah engineering is a challenging, but that makes it kind of fun too. I'm not a big partier or anything so I don't mind devoting the time to it. Engineering phsycs 1 and calc 3 are currently kicking my butt.

Hey it's 4am in Kansas, which begs the question, what are you doing up right now?

Yeah, i guess. How's Kansas State treating you? Here at UIUC it's almost impossible not to party, biggest greek school on campus + my stupid, naive self = too much staying up late and slipping grades.

 

[frostedflakes]

Just not tired, lol. But I'm sure I will be once 9:30 rolls around and I have to be in class.

KSU isn't bad. I actually grew up in Manhattan so I kind of knew what to expect, not really any surprises. My first semester I totally blew off school and ended up getting dismissed, so yeah definitely don't let those grades slip too much. Nothing wrong with having fun but you have to be careful, especially if you're in a more difficult major like engineering. I don't think I've met a person yet who was just able to breeze through engineering. Even if you're a pretty smart person you'll have to put some effort into it to maintain A's and B's. But that's why straight out of college we get paid $40-50k+ per year.

Anyways, have fun, and good luck w/everything.

 

[mwmorph]

Originally posted by: frostedflakes
Just not tired, lol. But I'm sure I will be once 9:30 rolls around and I have to be in class.

KSU isn't bad. I actually grew up in Manhattan so I kind of knew what to expect, not really any surprises. My first semester I totally blew off school and ended up getting dismissed, so yeah definitely don't let those grades slip too much. Nothing wrong with having fun but you have to be careful, especially if you're in a more difficult major like engineering. I don't think I've met a person yet who was just able to breeze through engineering. Even if you're a pretty smart person you'll have to put some effort into it to maintain A's and B's. But that's why straight out of college we get paid $40-50k+ per year.

Anyways, have fun, and good luck w/everything.

Thanks for the advice, I'm definitely concentrating no my grades now that i've seen my first 2 quiz grades in chem.

Originally posted by: 1000000
chem 102, then ignore my previous comment

EDIT: maybe if you gave more info such as the topic of the chapter this question relates to then mor epoeple can help you

Thanks for the effort, I just noticed you used your first and 2nd posts ever in my thread. That's almost as good as a Diamond/Lifer using their 10k post.

 

[intogamer]

Originally posted by: mwmorph

Originally posted by: frostedflakes
Just not tired, lol. But I'm sure I will be once 9:30 rolls around and I have to be in class.

KSU isn't bad. I actually grew up in Manhattan so I kind of knew what to expect, not really any surprises. My first semester I totally blew off school and ended up getting dismissed, so yeah definitely don't let those grades slip too much. Nothing wrong with having fun but you have to be careful, especially if you're in a more difficult major like engineering. I don't think I've met a person yet who was just able to breeze through engineering. Even if you're a pretty smart person you'll have to put some effort into it to maintain A's and B's. But that's why straight out of college we get paid $40-50k+ per year.

Anyways, have fun, and good luck w/everything.

Thanks for the advice, I'm definitely concentrating no my grades now that i've seen my first 2 quiz grades in chem.

Originally posted by: 1000000
chem 102, then ignore my previous comment

EDIT: maybe if you gave more info such as the topic of the chapter this question relates to then mor epoeple can help you

Thanks for the effort, I just noticed you used your first and 2nd posts ever in my thread. That's almost as good as a Diamond/Lifer using their 10k post. :)

lol postcount +1

 

[mwmorph]

Originally posted by: intogamer

Originally posted by: mwmorph

Originally posted by: frostedflakes
Just not tired, lol. But I'm sure I will be once 9:30 rolls around and I have to be in class.

KSU isn't bad. I actually grew up in Manhattan so I kind of knew what to expect, not really any surprises. My first semester I totally blew off school and ended up getting dismissed, so yeah definitely don't let those grades slip too much. Nothing wrong with having fun but you have to be careful, especially if you're in a more difficult major like engineering. I don't think I've met a person yet who was just able to breeze through engineering. Even if you're a pretty smart person you'll have to put some effort into it to maintain A's and B's. But that's why straight out of college we get paid $40-50k+ per year.

Anyways, have fun, and good luck w/everything.

Thanks for the advice, I'm definitely concentrating no my grades now that i've seen my first 2 quiz grades in chem.

Originally posted by: 1000000
chem 102, then ignore my previous comment

EDIT: maybe if you gave more info such as the topic of the chapter this question relates to then mor epoeple can help you

Thanks for the effort, I just noticed you used your first and 2nd posts ever in my thread. That's almost as good as a Diamond/Lifer using their 10k post. :)

lol postcount +1

Hey... whats the policy for neffing around here? Didnt the mods crack down on that after the huge nef fest of what? 2005 or 2006?

Ahh... memories.

 

[konakona]

homeworks suck.
rejoice and enjoy your temporary freedom ...while you can